The Optical Effects of Capping Layers on the Performance of Transparent Organic Light-Emitting Diodes

In transparent organic light-emitting diodes (TOLEDs), the asymmetry in the optical paths causes difference between the bottom and top emitting lights, both in emissions and spectral distributions. Capping layers (CLs) can be used as an optical functional to enhance the emissions and adjust the spec...

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Bibliographic Details
Published in:IEEE photonics journal 2012-02, Vol.4 (1), p.39-47
Main Authors: Jin Woo Huh, Jaehyun Moon, Joo Won Lee, Doo-Hee Cho, Jin-Wook Shin, Jun-Han Han, Joohyun Hwang, Chul Woong Joo, Jeong-Ik Lee, Hye Yong Chu
Format: Article
Language:English
Subjects:
bottom to top ratio
capping layer
high efficiency
Interference
Optical device fabrication
Optical films
Optical refraction
Organic light emitting diodes
refractive-index
spectra matching
Stimulated emission
Thickness measurement
Transparent organic light-emitting diodes
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Summary:In transparent organic light-emitting diodes (TOLEDs), the asymmetry in the optical paths causes difference between the bottom and top emitting lights, both in emissions and spectral distributions. Capping layers (CLs) can be used as an optical functional to enhance the emissions and adjust the spectral distributions. Here, we report on the optical effects of an organic CL, 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC), on the characteristics of TOLEDs Both simulated and experimental results are presented. We demonstrate the possibility of improving the total emission and achieving spectral matching of bottom and top emissions by varying the CL thickness. The optical effects of CLs have been interpreted from interference perspectives. Finally, we have presented a guideline that is practically useful in designing high-performance TOLEDs with CLs.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2011.2176478